THE CANCROID CRABS OF AMERICA 223 



atlas, 1855, pi. 7, fig. la-d. — R. Rathbun, Fisheries & Fishery Industries of 

 the U. S., sec. 1, 1884, p. 770, pi. 261.— Schmitt, Univ. Calif. Publ. Zool., 

 vol. 23, 1921, p. 229, and synonymy. 

 M etacarcinus magister A. Milne Edwards, Nouv. Arch. Mus. Hist. Nat., Paris, 

 vol. 1, 1866, p. 202, pi. 19. 



Diagnosis. — Carapace widest at tenth or last antero-lateral tooth. 

 Postero-lateral margin unbroken, entire. Antero-lateral teeth with 

 more or less prominent serrations anteriorly. Fingers of chelipeds 

 without dark color. 



Description. — Carapace with 10 antero-lateral teeth, counting the 

 orbital tooth, each acutely pointed at the anterior end, teeth 2 to 8, 

 inclusive, increasing successively in width; edges denticulate; lateral 

 tooth large, strongly projecting. Postero-lateral margin rimmed, 

 entire. Middle tooth of front slightly larger than those of outer 

 pair and more advanced. Inner orbital tooth considerably larger, 

 less produced and separated from the front by a broad interval. 

 Dorsal surface uneven, the elevated spots coarsely granulate. Basal 

 article of antenna very broad and well advanced. Merus of outer 

 maxilliped widened distally, its anterior margin forming a very obtuse 

 angle with outer margin. Merus of cheliped with a distal and a 

 subdistal spine above; wrist with a strong inner spine; hand with six 

 carinae on upper outer surface, the uppermost spinous, as is also the 

 upper margin of the dactyl for two-thirds of its length. Propodal 

 finger much deflexed. Fingers without dark color. Legs rough 

 above and very broad and flat, especially the propodus and dactylus 

 of the last pair. 



Color. — Light reddish-brown, darkest anteriorly, often light orange 

 below; inner sides of the anterior feet and hands crimson. (Stimp- 

 son.) 



Measurements. — Male (32235), length of carapace 126, width of 

 same 198, fronto-orbital width 48.2, width of front between antennae 

 12.3 mm. 



Range. — From Unalaska to Monterey Bay, Calif.^^ Low water to 

 50 fathoms. 

 Material examined. — 



ALASKA. — Off village of Iliuliuk, Unalaska; 6 fathoms; mud; 

 1871; W. H. Dall; 3 specimens (14666). 



East side Unga Island; 1872; Harrington and Hall; Dall collection; 

 1 male (14665). 



Sanborn Harbor, Nagai Island; low water; 1872; W. G. Hall; Dall 

 collection; 1 male (14663). 



" Lockington (Proc. Calif. Acad. Sci., vol. 7, 1876 (1877), p. 94 [1]), reported the young of C. magister from 

 Magdalena Bay. The present author is convinced that this is a mistake, as Monterey appears to be the 

 southern limit. Among large collections of Cancer examined from southern California, no C. magister has 

 been found. Lockington's specimens may well have been C.jordani. See "Ilelations" under Cancer 

 jordani in Harriman Alaska Exped., vol. 10, 1904, p. 177. 



